Your data is never used for ads, tracking, or anything else. An account is required to create posts only to minimize spam posts. Any location data is used solely for the purpose of displaying results relevant to you and your area. Location information is only saved in connection to added items. When an item is added to the map the location coordinates are saved to that item.
Your email is currently used for signing in. Currently we do not send any emails to your account. In the future, if emails are enabled, emails will be used for custom notifications and password resets.